A 16-bit console with hardware adapted from segas arcade board.
Fusion formally known as Kega Fusion is a Sega SG1000, SC3000, Master System, Game Gear and SegaCD emulator. In our opinion Fusion is the best Master System and Genesis emulator available.
Gens Plus! is a Sega Master System, Genesis, 32X, SegaCD and Game Gear emulator that is based on the Gens emulator with additional features. It ranks a close second to Fusion and isn't a bad choice.
Gens has been developing for a long time and is a very well known emulator and remains to be one of the best Genesis and Mega Drive emulators around. Due to its history it makes our list.